校园配送年费与买断怎么比较？用明确状态避免未知费用按零计算

def evaluate(items):
    if not isinstance(items, list) or not items:
        raise ValueError("items required")
    by_id = {}
    for item in items:
        key = item.get("id")
        if not isinstance(key, str) or not key or key in by_id:
            raise ValueError("invalid or duplicate id")
        by_id[key] = item
    total, missing = 0, []
    for key, item in by_id.items():
        status = item.get("status")
        if status == "quoted":
            value = item.get("amount_cent")
            if type(value) is not int or value < 0:
                raise ValueError("integer cents required")
            total += value
        elif status == "included":
            parent = by_id.get(item.get("parent"))
            if parent is None or parent.get("status") != "quoted":
                raise ValueError("quoted parent required")
            if "amount_cent" in item:
                raise ValueError("included item must not add money")
        elif status == "unknown":
            if "amount_cent" in item:
                raise ValueError("unknown must not carry money")
            missing.append(key)
        else:
            raise ValueError("invalid status")
    return {"complete": not missing,
            "total_cent": None if missing else total,
            "known_cent": total, "missing": missing}